wearing belts i always find, never stay where they feel comfortable

What fiona siad, sticking it in a freezer bag and sticking it in the back of your running tights is the best option....
I will deffo be sticking mine in a freezer bag this year, as when i had problems with my iPhone and had to take it back to apple, they argued and said i had dropped it in water as the white tab where u plug it in to charge was red, but it had change colour through to sweat

lucky the lady was nice enough to change it for me.